/Engine/Source/Editor/WorldPartitionEditor/Public/WorldPartition/SWorldPartitionEditorGrid2D.h
The system calls this method to notify the widget that a mouse button was release within it. This event is bubbled.
Whether the event was handled along with possible requests for the system to take action.
virtual [FReply](API\Runtime\SlateCore\Input\FReply) OnMouseButtonUp ( const [FGeometry](API\Runtime\SlateCore\Layout\FGeometry) & MyGeometry, const [FPointerEvent](API\Runtime\SlateCore\Input\FPointerEvent) & MouseEvent )